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CINEMATOGRAPHIC ANNUAL
ing either the film or the disc pickup in Machine No. 1 or Machine No. 2 . The next piece of apparatus in the circuit is the fader, the function of which is to control the volume of sound energy from this system. Following the fader is a switching panel
CXCITINC LAMP
PHOTOELECTRIC CELL
/ PHOTO
fol
FILM PICK-UP
AMPLIFIER
/'TXmachine t i
/REPRODUCER! ^J|7
PROJECTION ROOM
REPRODUCER TURNTABLE
SWITCHING PANEL
DOUBLE TURNTA8LE
4 2-A AMPLIFIER
43-A
AMPLIFIER
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(£L
1
MACHINE *2
GENERAL LAYOUT OF EQUIPMENT
WESTERN ELECTRIC SOUND PRO JECTOR SYSTEM
FIGURE 1
OUTPUT \-> CONTROL PANEL
which permits use of non-synchronous reproduction as well as synchronous reproduction. After the switching panel are the amplifiers, a more detailed discussion of which will follow. The next element in the circuit is an output control panel, the function of which is to join the amplifying units with the loud speaker or receiver units. The receivers, as has been stated, serve to transform the amplified electric energy into acoustic or sound energy.
DISC REPRODUCER
In elaborating on the above description, let us discuss first the method known as disc reproduction. In disc reproduction a magnetic type of reproducer is used almost exclusively. This type of reproducer consists of a stylus connected to an armature of high permeability which is located within a small coil. In operation the stylus attached to the armature vibrates as a needle follows the grooves on the sound record. The movement of the armature between the poles of the magnet which surrounds the armature causes a variation in magnetic lines of flux and a vol